caa a22 4500 477111971 CHVBK 20180405111611.0 cr unu---uuuuu 170330e19960501xx s 000 0 eng 10.1007/BF00011004 doi (NATIONALLICENCE)springer-10.1007/BF00011004 Localised impact of Sitka spruce ( Picea sitchensis (Bong.) Carr.) on soil permeability [Elektronische Daten] [Nick Chappell, Adam Stobbs, Les Ternan, Andrew Williams] A typical upland soil catena afforested with Sitka spruce (Picea sitchensis (Bong.) Carr.) was chosen to examine the localised effect of trees on soil permeability. A borehole permeameter was used to measure soil permeability at 0.2 m and approximately 2 m distance from the stem of 20 trees at a fixed measurement depth of 0.25 to 0.45 m. In the case of the ‘near-tree' measurements, this corresponded to soil beneath the main root plate of each conifer. Two principal elements of the soil catena: the ferric podzol of the mid-slope and histosol soil of the foot-slope were investigated. The preliminary data set shows that within the ferric podzol element, the permeability of the soil beneath individual conifers was a factor of 5.4 less than that of the adjacent soil. In contrast, within the histosol sub-tree permeabilities could not be distinguished from those of soil 2 m away from each tree. The decrease in sub-tree permeability within the podzol may be caused by sensitivity of the Bsl horizon to consolidation by tree weight or by enhanced illuviation resulting from changes in local soil chemistry. The histosol may be less sensitive to such processes. The results of a consolidation test applied to the Rawls and Brakensiek model of soil permeability supported the possible role of consolidation in the reduction of soil permeability beneath conifers in podzolic soil. Additional data on soil bulk density, porosity and texture are required to corroborate either the consolidation or illuviation hypotheses. As the Bsl horizon of ferric podzol soil is typically slowly permeable, a further decline may (i) restrict root development and thus, increase windthrow hazard, and (ii) increase the lateral flow of water within podzolic Eag horizons and thus affect stream acidification. Deep ploughing of a site prior to afforestation may mitigate such impacts. Kluwer Academic Publishers, 1996 borehole permeameter nationallicence hydraulic conducivity nationallicence podzol nationallicence sitka spruce nationallicence soil permeability nationallicence Chappell Nick Institute of Environmental and Biological Sciences, Lancaster University, LA1 4YQ, Lancaster, UK aut Stobbs Adam Institute of Environmental and Biological Sciences, Lancaster University, LA1 4YQ, Lancaster, UK aut Ternan Les Department of Geographical Sciences, University of Plymouth, PL4 8AA, Plymouth, UK aut Williams Andrew Department of Geographical Sciences, University of Plymouth, PL4 8AA, Plymouth, UK aut Plant and Soil Kluwer Academic Publishers; gopher://gopher.wkap.nl 182/1(1996-05-01), 157-169 0032-079X 182:1<157 1996 182 11104 https://doi.org/10.1007/BF00011004 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00011004 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Chappell Nick Institute of Environmental and Biological Sciences, Lancaster University, LA1 4YQ, Lancaster, UK aut NATIONALLICENCE 700 1- Stobbs Adam Institute of Environmental and Biological Sciences, Lancaster University, LA1 4YQ, Lancaster, UK aut NATIONALLICENCE 700 1- Ternan Les Department of Geographical Sciences, University of Plymouth, PL4 8AA, Plymouth, UK aut NATIONALLICENCE 700 1- Williams Andrew Department of Geographical Sciences, University of Plymouth, PL4 8AA, Plymouth, UK aut NATIONALLICENCE 773 0- Plant and Soil Kluwer Academic Publishers; gopher://gopher.wkap.nl/ 182/1(1996-05-01), 157-169 0032-079X 182:1<157 1996 182 11104 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer